Java Language Calendar and its Subclasses Subtracting calendars

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Example

To get a difference between two Calendars, use getTimeInMillis() method:

Calendar c1 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();
c2.set(Calendar.DATE, c2.get(Calendar.DATE) + 1);

System.out.println(c2.getTimeInMillis() - c1.getTimeInMillis()); //outputs 86400000 (24 * 60 * 60 * 1000)


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